Datasheet LT3580 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | Boost/Inverting DC/DC Converter with 2A Switch, Soft-Start, and Synchronization |
| Páginas / Página | 28 / 1 — FEATURES. DESCRIPTION. 2A Internal Power Switch. Adjustable Switching … |
| Formato / tamaño de archivo | PDF / 302 Kb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTION. 2A Internal Power Switch. Adjustable Switching Frequency. Single Feedback Resistor Sets VOUT
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Versión de texto del documento
LT3580 Boost/Inverting DC/DC Converter with 2A Switch, Soft-Start, and Synchronization
FEATURES DESCRIPTION
n
2A Internal Power Switch
The LT®3580 is a PWM DC/DC converter containing an n
Adjustable Switching Frequency
internal 2A, 42V switch. The LT3580 can be configured n
Single Feedback Resistor Sets VOUT
as either a boost, SEPIC or inverting converter. Capable n
Synchronizable to External Clock
of generating 12V at 550mA or –12V at 350mA from a n High Gain SHDN Pin Accepts Slowly Varying 5V input, the LT3580 is ideal for many local power supply Input Signals designs. n Wide Input Voltage Range: 2.5V to 32V The LT3580 has an adjustable oscillator, set by a resistor n Low VCESAT Switch: 300mV at 1.5A (Typical) from the RT pin to ground. Additionally, the LT3580 can n Integrated Soft-Start Function be synchronized to an external clock. The free running or n Easily Configurable as a Boost or Inverting Converter synchronized switching frequency range of the part can n User Configurable Undervoltage Lockout (UVLO) be set between 200kHz and 2.5MHz. n Tiny 8-Lead 3mm × 3mm DFN and 8-Lead MSOP Packages The LT3580 also features innovative SHDN pin circuitry that allows for slowly varying input signals and an adjust- able undervoltage lockout function.
APPLICATIONS
Additional features such as frequency foldback and n VFD Bias Supplies soft-start are integrated. The LT3580 is available in tiny n TFT-LCD Bias Supplies 3mm × 3mm 8-lead DFN and 8-lead MSOP packages. n GPS Receivers L n , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear DSL Modems Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other n Local Power Supply trademarks are the property of their respective owners.
TYPICAL APPLICATION 1.2MHz, 5V to 12V Boost Converter Achieves Over 88% Efficiency Efficiency and Power Loss
95 1200 4.2μH VOUT VIN 12V 90 5V 550mA 1000 10μF 85 VIN SW POWER LOSS (mW) SHDN 80 800 GND LT3580 130k 75 RT FB 600 VC 70 SYNC SS 10k EFFICIENCY (%) 65 400 2.2μF 75k 0.1μF 1nF 60 3580 TA01 200 55 50 0 0 100 200 300 400 500 600 LOAD CURRENT (mA) 3580 TA01b 3580fg 1
FEATURES DESCRIPTION
n
2A Internal Power Switch
The LT®3580 is a PWM DC/DC converter containing an n
Adjustable Switching Frequency
internal 2A, 42V switch. The LT3580 can be configured n
Single Feedback Resistor Sets VOUT
as either a boost, SEPIC or inverting converter. Capable n
Synchronizable to External Clock
of generating 12V at 550mA or –12V at 350mA from a n High Gain SHDN Pin Accepts Slowly Varying 5V input, the LT3580 is ideal for many local power supply Input Signals designs. n Wide Input Voltage Range: 2.5V to 32V The LT3580 has an adjustable oscillator, set by a resistor n Low VCESAT Switch: 300mV at 1.5A (Typical) from the RT pin to ground. Additionally, the LT3580 can n Integrated Soft-Start Function be synchronized to an external clock. The free running or n Easily Configurable as a Boost or Inverting Converter synchronized switching frequency range of the part can n User Configurable Undervoltage Lockout (UVLO) be set between 200kHz and 2.5MHz. n Tiny 8-Lead 3mm × 3mm DFN and 8-Lead MSOP Packages The LT3580 also features innovative SHDN pin circuitry that allows for slowly varying input signals and an adjust- able undervoltage lockout function.
APPLICATIONS
Additional features such as frequency foldback and n VFD Bias Supplies soft-start are integrated. The LT3580 is available in tiny n TFT-LCD Bias Supplies 3mm × 3mm 8-lead DFN and 8-lead MSOP packages. n GPS Receivers L n , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear DSL Modems Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other n Local Power Supply trademarks are the property of their respective owners.
TYPICAL APPLICATION 1.2MHz, 5V to 12V Boost Converter Achieves Over 88% Efficiency Efficiency and Power Loss
95 1200 4.2μH VOUT VIN 12V 90 5V 550mA 1000 10μF 85 VIN SW POWER LOSS (mW) SHDN 80 800 GND LT3580 130k 75 RT FB 600 VC 70 SYNC SS 10k EFFICIENCY (%) 65 400 2.2μF 75k 0.1μF 1nF 60 3580 TA01 200 55 50 0 0 100 200 300 400 500 600 LOAD CURRENT (mA) 3580 TA01b 3580fg 1